The total net metabolic power output (Ė, kW) required to scull a traditional, flat hull boat - the "Bissa", 9.02 m long and weighting about 500 kg including the crew - was assessed at different constant speeds (ν) ranging from 2.44 to 3.75 m s-1. Ė increased with the speed: Ė = 0.417 × e0.664ν; r2 = 0.931. The amount of metabolic energy spent per unit distance (C, J m-1) to move the "Bissa", calculated by dividing Ė by the corresponding ν, was a linear function of ν: C = 0.369 ν -0.063; r2 = 0.821. The hydrodynamic resistance met by the boat in the water - drag (D, N) - was estimated by analysing the decay of the reciprocal of ν as a function of time measured during several spontaneous deceleration tests carried out in still water and by knowing the total mass of the watercraft plus crew. D increased as a square function of speed: D = 12.76 v2. This allowed us to calculate the drag efficiency (ηd), as the ratio of D to C: ηd increased from 8.9 to 13.7% in the range of the speeds tested. The "Bissa" turned out to be as economical as other flat hull, traditional watercrafts, such as the bigger Venetian gondola, and her ηd was similar to that of other modern and traditional watercrafts. © Springer-Verlag 2008.

Energy cost and efficiency of Venetian rowing on a traditional, flat hull boat (Bissa)

Abstract

The total net metabolic power output (Ė, kW) required to scull a traditional, flat hull boat - the "Bissa", 9.02 m long and weighting about 500 kg including the crew - was assessed at different constant speeds (ν) ranging from 2.44 to 3.75 m s-1. Ė increased with the speed: Ė = 0.417 × e0.664ν; r2 = 0.931. The amount of metabolic energy spent per unit distance (C, J m-1) to move the "Bissa", calculated by dividing Ė by the corresponding ν, was a linear function of ν: C = 0.369 ν -0.063; r2 = 0.821. The hydrodynamic resistance met by the boat in the water - drag (D, N) - was estimated by analysing the decay of the reciprocal of ν as a function of time measured during several spontaneous deceleration tests carried out in still water and by knowing the total mass of the watercraft plus crew. D increased as a square function of speed: D = 12.76 v2. This allowed us to calculate the drag efficiency (ηd), as the ratio of D to C: ηd increased from 8.9 to 13.7% in the range of the speeds tested. The "Bissa" turned out to be as economical as other flat hull, traditional watercrafts, such as the bigger Venetian gondola, and her ηd was similar to that of other modern and traditional watercrafts. © Springer-Verlag 2008.
Scheda breve Scheda completa Scheda completa (DC)
2009
105
4
653
661
Efficiency; Energy cost of rowing; Venetian rowing; Water drag; Adult; Biomechanical Phenomena; Energy Metabolism; Humans; Male; Middle Aged; Muscle, Skeletal; Oxygen Consumption; Physical Exertion; Ships
Capelli C.; Tarperi C.; Schena F.; Cevese A.
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Utilizza questo identificativo per citare o creare un link a questo documento: `https://hdl.handle.net/2318/1770686`